Annick Goutal? What, who is that?
A nervous pilot means that he/she is uncomfortable about something which does not look or seem right and he/she needs to avoid taking off, landing, or (going thru/very near some weather?) doing whatever they are about to do, especially IF plenty of reserve+contingency fuel is still available. Forget the extra cost or scheduled departure/arrival time!
Awkward might be the word when flying with a First Officer who seems a bit sarcastic quite often and needs to be more patient waiting for a captain's slot in a few more years.
Iggy, know you read German, so for an answer to your question, look
here 
Rgrds
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